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(11)

EP 2 411 849 A1

(12)

(43) Date of publication: 01.02.2012 Bulletin 2012/05 (21) Application number: 10712610.4 (22) Date of filing: 17.03.2010

(51) International Patent Classification (IPC):  G02B 1/10(2006.01) C03C 17/245(2006.01) F24J 2/10(2006.01) C03C 17/00(2006.01) C03C 17/36(2006.01) (86) International application number: PCT/US2010/027556 (87) International publication number: WO 2010/111075 (30.09.2010 Gazette 2010/39)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 27.03.2009 US 164047 P 19.02.2010 US 709045 19.02.2010 US 709091 (71) Applicant: PPG Industries Ohio, Inc. Cleveland, OH 44111 (US)	(72) Inventors: BHANDARI, Abhinav Cranberry Pennsylvania 16066 (US) BUHAY, Harry Allison Park Pennsylvania 15101 (US) SISKOS, William, R. Delmont Pennsylvania 15626 (US) THIEL, James, P. Pittsburgh Pennsylvania 15223 (US) (74) Representative: Polypatent  Braunsberger Feld 29 51429 Bergisch Gladbach 51429 Bergisch Gladbach (DE)